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Linux 2.6 - man page for getresgid (linux section 2)

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GETRESUID(2)			    Linux Programmer's Manual			     GETRESUID(2)

NAME
       getresuid, getresgid - get real, effective and saved user/group IDs

SYNOPSIS
       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #include <unistd.h>

       int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
       int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);

DESCRIPTION
       getresuid()  returns  the  real	UID,  the effective UID, and the saved set-user-ID of the
       calling process, in the arguments ruid, euid, and suid,	respectively.	getresgid()  per-
       forms the analogous task for the process's group IDs.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       EFAULT One  of  the  arguments  specified an address outside the calling program's address
	      space.

VERSIONS
       These system calls appeared on Linux starting with kernel 2.1.44.

       The prototypes are given by glibc since version 2.3.2, provided _GNU_SOURCE is defined.

CONFORMING TO
       These calls are nonstandard; they also appear on HP-UX and some of the BSDs.

NOTES
       The original Linux getresuid() and getresgid() system calls supported only 16-bit user and
       group  IDs.   Subsequently,  Linux  2.4	added getresuid32() and getresgid32(), supporting
       32-bit IDs.  The glibc getresuid() and getresgid() wrapper  functions  transparently  deal
       with the variations across kernel versions.

SEE ALSO
       getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2010-11-22				     GETRESUID(2)
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